Casing elevator



1927' E. E. GREVE CASING ELEVATOR Filed Sept. 27, .1923

g gVENTOR Patented Feb. 22, 1927.

UNITED STATES EDGAR E. GBEVE, OF BELLEVUE, PENNSYLVANIA.

CASING ELEVATOR.

Application filed September 27, 1923 Serial No. 665,093.

This invention relates to an elevator for manipulating well casings in the operation of earth boring.

The invention relates generally to the type of elevator shown in my prior United States Letters Patent No. 1,180,031 of April 18, 1916, in which there is a main body on which are two pivoted doors.

The present invention relates particularly to an improved latching means for holding the doors closed, which latching means is particularly suited for an apparatus of this kind wherein a high safety factor must be combined with facility of operation, so that sections of easing or drill pipe, in rotary drilling operations, may be. safely but easily and rapidly handled.

The invention may be readily understood by reference to the accompanying-drawings, in which:

Fig. 1 is a top plan view of an elevator embodying my invention; and

Fig. 2 is a side view thereof.

In the drawings, 5 designates the main body of the elevator. On the body 5 at diametrically opposite points, are trunnions 6 to which a bail, not shown, is attached, for suspending the elevator in the usual manner.

At 6 are pivots or hinges for the doors 7 and 8. On the door 7 are two bosses designated 9 to which a fixed handle 10 is socured. On the free edge of, door 7, between the lugs or bosses 9, is a hook-like projection 11, the nose 12 of the hook portion of which is turned away from the door 8, and is rounded, as shown in Fig. 1.

On the door 8are two bosses orears 13 in which is rotatably carried a shaft 14 having an eccentric cam 15 secured thereto,-this cam being secured to that portion of the shaft between the two lugs. The ends of the shaft project beyond the lugs, and secured to these ends and fast thereto, are the ends of a handle 16.

The eccentric 15 is fitted in and passed through the inner end portion of a locking member 17. This locking member has a hook 17 on its outer end for cooperation with hook 11. On the locking member is a hook-like abutment 18, against which spring 19 re-acts, this spring being looped around shaft 14 and being confined by a rib 20 on the door 8. The locking member also has lugs 21 thereon. which engage against door 8 when the hook is in the latching position of Fig. 1, whereby the hook is prevented from ever swinging in beyond the position shown. This is important because, when the doors are opened, the spring would tend to urge the latch around so that it would otherwise swing too far inwardly and be in the way.

In use, the elevator, when the doors are closed, engages the casing or drill pipe, shown in section in Fig. 1 and designated A, in the usual manner. The hook 17 engages with hook 11 to hold thedoors against opening, and the spring 19 tends to hold the parts in this position. Movable handle 16 is then nearly, but not quite, parallel with fixed handle 10. To open the doors, handle 16 is moved in an are in the direction of the arrow of Fig. 1. This rotates shaft 14 and eccentric 15, to reciprocate member 17 until hook 17 a is disengaged from under the nose 12 of hook 11. Then, by pulling on both handles, the doors maybe fully opened.

'As soon as handle 16 is released, spring 19 urges member 17 into locking position, even though the doors be opened. Consequently, to lock the doors, it is only necessary to move. them into closed position. Hook 17 riding 011 rounded nose 12 of hook 11 will slide thereon, and so is easily moved into locking position.

When the doors are locked, the doors can only be opened by moving handle 16 away from handle 10. Consequently, any obstruction which the elevator might engage in operation must be of a nature that would apply a pressure between the handles before the doors would open, and such obstruction is not likely to be encountered in a manner to open the doors. The arrangement of a reciprocable latch not only provides an elevator which is substantially proof against accidental opening, but also provides a structure wherein the doors may be drawn together into a tight gripping relation with a section of pipe or casing after the doors have been closed, and this can he done with considerable ease.

Various changes and modifications may be made in the invention within the contern into and out of locking position including extending movable handle on the second an eccentric secured to the latch and a handle for moving: the eccentric, and a hook with which the latch cooperates.

2. A casino; elevator having a door, it latch pivotally and reciprocably mounted on the door, means for reciprocating the latch into and out of locking position including a shaft having an eccentric and a. handle mounted thereon, lnealr-s tor 1Jrerei'ltingr the latch from sn'ine'ing inwardly past an operative position, and a hook with which the latch cooperates. i

#3. l=\'( 'asin 51'elevatorhnringa door, a latch pivotall); and rcciprocahly mounted on the door, means For moving; the latch into and out oi operative engagement including a. shaft carried by the door, an eccentric coitnecting the latch and the shaft, and a handle secured to the shatt.

l. A casing elevator harinna door, a latch pivotally and rcc procahl t mounted on the door, means for n'ciproiaiting; the latch into and out of lot-kin; auction incliulin a shaft having an eccentric and a handle .lnouutet'l thereon, a spring "l or resiliently urging the latch to and holding" it in loching position, means [or preventing the latch from swinging inwardly out ot an operating position, and a hook with which the latch cooperates.

5. A rasing elevator having a door, a latch pivotally and I'QCllillt'lrtllily mounted. on the door, means for reciproeating the latch into and out of locking position including a handle, an abutment on the latch, an abutment on the door, and a spring: confined hetween said abntments for resiliently urging the latch into latching position, and a hook with which the latch cooperates.

(3. A casing elevator comprising. a body, a. pair of doors on the body, a longitudinally extending lixed handle on one door, a tired latch engaging member on the same. door, a latch on the second door, a longitudinally door operatively connected with the latch, the two handles heinp; relatirely close together when the doors are latched, said latch open ating handle being, mo "able away from the tixed handle to release the latch, said listed handle thus forming a guard for the inorable one. i

7. A casing elerator comprising a body,

a pair of doors on the body, a hook having:

slide over the nose oi the first hook and for cooperation with said first hook, said latch being pivotally and slidably mounted on the door, a spring for urging the latch to locking position, and an operating mech anism for the latch including; a shaft, an eccentric connecting the latch and the shaft, and a handle on the shaft.

8. A casing elevator coniprisiinr a body, a pair o l doora on the body, a hook having a rounded nose portion on one door, a, latch on theother door having a hook adapted to slide over the nose of the first hook and for cooperation with said first. hook, said latch being pivotally and lidahl mounted on the, door, a spring; for urging the latch to loch" inc position, an operating 1necha1'iis1n tor the latch, and means on the latch for holdline; it l'roin swinging; inwardly past hook cu- ;raging position. p

U. A. canine elera tor includiin; a body baring; two hinged doors thereon, a. lined handle on, one door, a latch itgr'ag'ior, menn her on the same door, spaced apart; lugs on the other door, a. shaft jfillllltllttl in the lungs, an eccentric on the shatt, a latch member .rotatablycarried on the eccentric and adapted to be reciprocated thereby, and a handle lined on the shal't for moving; the eccentric.

10. A casing elevator including a. body having two hinged doors thereon, a fixed handleon one door, a latch engaging memher on the same door, spaced apart lugs on the other door, a shaft journaled in the lugs, an eccentric on the shatt, a latch n'ieinber rotatahl carried on the eccentric and adapt ed to ho reciprocated thereby, a handle fixed on the shaft for moving the eccentric, and a spring on the ehatt engaging the latch and engae'iire the door rt'or urging the latch to latching,- position.

ii. A casing elevator including, a. body having two hinged doors thereon, a lined handle on the lirstdoor, a latch engaging member on the same door, spaced apart lugs on the second door, a shaft jom'naled in the lap; an eccentric on the shaft, a latch member rotatahly carried on the eccentric and adapted to he reciprocattwl thereby, av handle lined on the shaft for moving the eccentric, and a log" on the latch for engagement with the second door for keeping the latch from swinging" inwardly past operative position.

Tn testimony whereof l: atlix my signature.

EDGAR E. GREVE.

till 

